Chuck



Patented .lune 28, 1927.

NETE

HARRY E. sLoAN, or HAR'rroR COMPANY, or HARTFORD, C

-STA

D, CNNRCTICUT, AssIe'NoR 'rc THE cusHiviAN CHUCK ONNRCTICUT. ACORPORATION or CoNNEC'rroU'r.

TES

CHUCK.

Applicationled May A5, 1922. Serial No. 558,560.

My invention relates more especially to that class of chucks embodyingjaws radially movable on its face, and vention, vice of this classhaving inea.

an object of my inamong others, is to provide a dens for support` ingthe feed screws in a particularly eiicient millllle'.

A form of chuck embodying my invention and in the construction and useof which the objects herein set out, as well-as others, may be attained,is illustrated in the accompanyling drawings, in which `Figure 1 is aview in side elevation of a chuck embodying my linvention with one sidebroken away in central section to illustrate construction.

Figure 2 is a face view of a portion of the chuck illustrated in Figure1.

Figure 3 is a through a feed screw support partially cut away, an

detail view in section fragment of the chuck showing the dA said bearingcomprising straps 15 extending in section on plane 3 3 of Figure 1.

Figure if 'is a detail view in a fragment of the chuck illus sectionthrough trating another arrangement of the feed screw support.

Figure 5 is a view in sec fragment of the chuck on a tion through aplane denoted by the dotted line 5-5 of Figure 4.

It is of the type illustrated herein provided for readily materialadvantage in chucks of that means be inserting the feed screw and thesupport therefor, and without removing parts of the ch improved device Ihave means, having so constructed uck, and in my provided such the feedscrew support that it may be inserted into the chuck jaw grooves chuck,as to one port acting to tion, and said port in place, the drawingsdenotes the body of a chuck screw acting to from the face of the form ofthe device, the supretain the feed screw in posi- -retain the supsuchstructure being shown in herein in which the numeral 5 having slots 6radially arranged therein with guides 7 in the form of iibs on the sidewalls of the groove, which guides are received within guide grooves S inopposite jaws 9. Feed screws 10 mounted in the chuck body 5 each of thejaws,

sides of chuck are rotatably appurtenant to the threads of the screwsmeshing with racks 11 on the bottoms of the jaws 9. of old and wellwhich the feed screws may connected for simultaneous rI`he parts thusfar described are known construction, in

oi' may not be operation, such connection when employed being wellunder-k stood by those skilled in the art.'

Prior to my invention various means have been employed for supportingthel feed screws 10 and my invention has to do with the means forsupporting them in a manner to obtain advantages not present in previousstructures.

To this end I form holes'12 preferably extending through the chuckfbodyfrom thel from each `suppoit and preferably meeting at their ends, a.bearing being thus formed for a feed screwlO. Each feed screwk isprovided with an annular Groove 16 located between its ends, preferablynear thecenter, said groove being provided by reducing the size'of thefeed screw as at 14. Pins 17 may be employed, if desired, to preventrelative movement of the two members of eachv screw support. Inassembling the device the two members of a screw support are placedtogether to inclose a feed screw .between them, the annular groove inthev feed screw receiving thefstraps 15 that closely fit with` in thegroove to provide a bearing for said screw. Said screw and support arethen insertedl from theface of the chuck body through a groove, the bodyof the support being enteredinto a hole 12. A jaw 9 is now inserted attheend of its groove and engaged with 'thethreads von `the feed screwthat may be turned in any suitable manner, a socket in the end of thescrew to receive a wrench being commonly employed (to move the aw toplace). The straps encircling the bearingk portion of the screw retainthe support in place and the members of the support are held together bythe walls ofthe hole in which the support is located, this t0 retain thestra-p in engagement with the bearing portion of the screw by reason ofthe fit of the body portion of the support 13 in its hole 12. It willthus be seen that the screw and the support mutually act to retain eachother in place, the support retaining the screw against longitudinalmovement and the screw preventing displacement of the support.

In Vorder to prevent unintentional rotation of the feed screw 10 and aconsequent loosening of the jaws 9, I provide means for placing a springtension upon the feed screws, such means, in the specific form of theinvention illustrated herein, embodying a tension Screw 18 fitting ascrew threaded hole in. the support 13, such threaded hole being formedin the parts of the members comprising the support. A tensioning' washer19 is seated against the bottom of a counterbore 2() at the mouth of thehole 12 to support the tension screw 18, a tensioning member, as shownherein in the form of a spring washer 21 being placed under the head ofthe screw 18 and between the under side of said head-and the washerl 19.

The support 13 is, therefore, made use of as a means for placing tensionupon the feed screw, such support serving a very useful function in thisconnection.

The invention above described is illustrated as embodied in anindependent chuck, that is, a chuck in which each of the aws areindependently movable.

In that form of the device shown in Figures l and 5 another adaptationof the screw support is illustrated, this in connection with what isknown as a universal chuck, that is, a chuck in which all of the jawsmay be simultaneously moved in their slots. In this structure the chuckbody 22 is provided with the usual feed scroll 23 operated as by meansof a feed pinion 24, all constructed in any ordinary and well knownmanner. rIhe feed scroll meshes with a rack 25 on the und-er surface ofa jaw carrier 2G, al screw rack on the upper surface of said carrierreceiving the threads of a feed screw 27 mounted in the chuck body andin engagement with the segments of screw threads on the under side ofchuck jaws 28, all of which parts are of old and well knownconstruction.

In adapting my invention to this form of chuck the support 29 isinserted into ahole 30 in the bottom of each of the chuck jaws, thestraps of the support encircling the feed out.

screw as in the structure iii-st hereinbefore described.

A tension screw 31 is inserted into the support from the top of thejaws, the head of the screw being seated upon a tensioning member in theform of a spring washer 32 in the bottom of a counterbore 33 at themouth of the hole in which the screw is located, said hole communicatingwith the hole 30 for the support.

In accordance with the provisions of the patent statutes I havedescribed the principles of operation of my invention, together with thedevice which I now consider to represent the best embodiment thereof;but I desire to have it understood that the device shown is onlyillustrative and that the invention may be carried out by other meansand applied to uses other than those above set 1. A chuck comprising a.body and a chuck jaw slidably mounted thereon, one of said membershaving` a hole therethrough including a counterbored portion,a feedscrew support comprising two lmembers engaging a feed screw fromopposite sides to afford a support therefor, said members fitting saidhole whereby they are held together, a retaining screw fitting athreaded opening in said support, a tensioning device located underneaththe head of said screw to eXert pressure thereagainst that is resistedby the bottom of said counterbored part, and a jaw feeding screw engagedby said support and held thereby.

2. A chuck comprising a body, a feed screw for a jaw located on thebody, a chuck jaw slidably mounted on the body in engagement with saidfeed screw, a feed screw support con'iprising two members engaging saidfeed screw from opposite sides to afford a support therefor, saidmembers fitting a hole in said body whereby they are held together, aretaining screw engaged with said support, and-a tensioning devicelocated underneath the head of said screw to exert pressure thereagainstthat is resisted by the bottom of a counterbored hole in said body.

HARRY E. SLOAN.

